Two finger scrolling and left-click works out of the box. Unfortunately the right-click is not functional.

To enable most of the multitouch touchpad features (even right and middle clik) use mtrack, which is avaible in AUR. The configuration is done via the /etc/X11/xorg.conf.d/10-mtrack.conf file. Check if the mtrack module is properly loaded in the /var/log/Xorg.0.log file. Sometimes xorg loads other drivers before, like eg. synpatics, and the mtrack driver is not used at all.